What the answer for question 28 and 29 answer correct

The system of checks and balances ensures that

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

The american civil war most former enslaved african americans in texas began making a living as